Gauge



Patented Mar. 13, 1923.

UNITED STATES 1,448,373 PATENT OFFICE.

MAX BARTHOLDY, OF ESSEN, GERMANY, ASSIGNOB 'IO FRIED. KRUPP AKTIEN- GEBELLSCHAFT, OF ESSEN-ON-THE-RUHR, GERMANY.

GAUGE.

Application flied March 10, 1922.

To all whom it may concern:

Be it known that 1, MAX BARTHOLDY, residing at Essen, Germany, a citizen ofthe German Republic,.have invented a certain new and useful Improvement in :1. Gauge, of

which the following is a specification.

This invention relates to gauges of the kind in which the gauge-body carries a bolt which has a gaging surface and is axially adjustable but held against rotation in the gauge-body.

In a known gauge of this kind the gaging bolt is shiftable axially by means of a screw which, in its turn, is mounted non-shiftably in the gauge body and meshes with an internally threaded bore of the gaging bolt. With this known construction, the bearing surface of the gaging bolt is of course considerably decreased, and consequently the guiding of the bolt grows worse the more the bolt extends beyond the gauge-body. Besides, such arrangement has the disadvantage that the diameter of the gaging bolt is bound to a certain minimum measure, as otherwise the screw engaging the bolt would have to be made of too small dimensions. These disadvantages are obviated by the construction of the gauge according to the present invention.

Besides this, the invention has for its object to provide a very compact gauge of the said type, the adjustment of which to a standard measure can be effected accurately and simply within a short time.

With these ends in view the invention consists in the arrangement, construction and combination of the arts to be herein described and particularly pointed out in the appended claim.

In the drawings:

Fig. 1 is aview, partly in section, of a snap-gauge constructed in accordance with the invention;

Fig. 2 is a transverse section on the line 2-2 of Fig. 1, seen from the left.

Referring now to the drawings, in which similar characters of reference indicate corresponding parts, A designates the frame of.- the gauge. One end of the frame A carrise a housin. A in which a pin C is shiftably mounted which is ada ted to actuate the pointer B of an indicator --a. Mounted in front of the pin C is a ball D adapted to roll on a stationary obli ue face a and projecting somewhat from t e housing A Serial No. 542,772.

The ball D constitutes the movable ga ing member of the gauge. The other end of the frame A which is opposite to the ball D, forms a socket-like enlargement a in which a bolt E is mounted which forms the fixed hut adjustable gaging member of the gauge.

The bolt E has a cylindrical portion which is provided with mlllimeter graduation '2 which correspond to the distance ,b'e'dwe'en the bolt E and the ball D when the latter is in a definite position. The bolt E is" surrounded by a sleeve F which is mountedfor rotation in the socket a and which is provided with longitudinal slots The end of the sleeve F which is remote rom the gaging surface of the bolt E, is provided with an internal screw thread which is in engagement with a corresponding externally threaded portion 6 of the bolt E, so that an adjustable connection is established between the parts E and F. The other end of the sleeve F, which is situated adjacent to the gaging surface of the bolt E and projects be ond the socket a", is provided with a col ar f preferably knurled. This collar f tapers into 'a cone 7 forming a sharp reading-off edge f. The collar f is caused to abut against the socket a from the exterior by the action bf a spring G one end of which bears against a disk 6 which is fastened to the bolt E, while its other end bears against a split clamping ring H surrounding the sleeve F and abutting against an inwardly projecting annular flange a of the socket a. The disk a pomesses a projection e which engages a longitudinal groove 0. of the socket a. so that the bolt E is held against rotation. The clamping ring H is provided with two recesses h constituting two stop-faces h and h, respectively, (Fig. 2). The wall of the socket a is provided with alined screwthreaded holes receiving screws J and K, the screws J having a knurled head and being adjustable in the hole receivin it. Its inner end bears against the stopace h, while the screw K is stationary with relation to the socket a, and has its inner end bearing against the stop-face It. When using the gauge, the screw J is tightened so as to cause the clamping ring H to press the slotted sleeve F tightly around the bolt E, whereby any shifting of the bolt E as well as of the sleeve F is rendered impossible. The outer end of the socket-like enlargement a is closed by a cap a" screw threaded thereon whereby access may be had to the interior of the enlargement a by removing this cap a.

In case a body should be tested by means of the gauge described, the said body is introduced between the ball I) and the bolt E. If the respective body has at least approximately the exact measure, the ball I) will be slightly pressed back into the boasing A so that it will roll up the oblique face a" and cause the pin C to be shifted in the direction of the arrow :I'. The shiftingof the pin (3 will produce a deflection of the pointer B which indicates, whether the body to be tested possesses a sufficiently accurate measure. \Vith the position of the bolt E illustrated in Fig. 1, the gauge is adapted for testing bodies the length or diameter of which should be 80 min. for example. If bodies of smaller dimension, for example 75 mm., should betested, the knurled screw, and therewith the clam )ing ring H, are loosened, whereupon the sleeve F will be rotated. This rotation will cause an axial shifting of the bolt E, and is continued until the division mark 75 of the graduation 6 will come to meet the reading-off edge f. It is then examined,by the aid of a standard caliper-pin, whether the adj usted measure is exactly equal to 75 mm. If the measure is found to be accurate, the ointer B will have to take the position in icating zero on the scale (1?, otherwise the bolt, E will have to be adjusted more accurately. The screw J is then tightened, and the gauge is ready for use again. Any play a-t'the screwthreads between the bolt E and the. sleeve F is excluded by the action of the spring (1 so that any shifting of the bolt E after its adjustment, before the sleeve F is clamped to the bolt E by means of the clamping rin 1-], is )revented.

lt wilt be evident from the foregoing description that the adjustment of the gauge can be efficiently and reliably performed within a very short time. Besides, the con struction of the gauge is simple and com- )act; nevertheless, the mounting of the bolt l) in the socket a* or sleeve F, respectively, is such as to secure a uniformly good guiding of the bolt E in every position, The diameter of tho bolt E is not subiek-t to any limitations.

( laim:

A gauge, comprising a frame carrying oppositely disposed spaced gauge points one of which is formed by a graduated bolt which is mounted for actual shifting motion in the said frame and which is provided with means for locking the bolt against rotation, said graduated bolt having an externally threaded portion, an internally threaded sleeve rotatably mounted in the frame of the gauge, said sleeve surrounding the graduated bolt and meshing with the threaded portion of the same, and means for locking the said sleeve against shifting motion.

The foregoing specification signed at Essgg Germany, this 3rd day of February, 1

MAX BARTHOLDY.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,448,373, granted March 13, 1923, upon the application of Max Burtholdy, of Essen, Germany, for an improveiiient in Gauges, an error appears in the printed specificetlon requiring corrwtion as follows: Page 2 line 58, the claim, for the word actual reed axial,- and that the said Letters ietent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofliee.

Signed and sealed this {id day of April, A. D., 1923.

[mL] KARL FENNING,

Acting Gome'uionor of Paton-ta. 

